Automatic boring-machine.



D. L. CALAHAN.

AUTOMATIC BORING MACHINE. wucmon FILED MAR. 11, l9l6.

Patented Mar. 13, 1917.

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v D. L CALAHAN.

AUTOMATIC BORING MACHINE.

1 ,APPLICAHON FILED MAR. H, 1916.

2 SHEETS-SHEET 2.

' Witnesses I fizl Inventor Attorneys Patented Mar. 13, 1917.

boring g A I DELGNA L. CALAHAN, 0F FAIRFAX, WASHINGTON, ASSIGNOB, TO MANLEY, M9033 LUMBER SOMPANY, OF TACOMA, WASHINGTON."

AUTOMATIC BORING-MACHINE.

Application filed March 11, 1916.

tion to provide a novel and improved ma.

chine for boring out columns, especially, al.- though the machine may be employed for out pedestals, balusters, posts and the like.

The object of the invention is the provision of a machine for boring out the column to lengthen or increase the life thereof, and for counter-boring or reaming out the wood at one end of the column to leave a relatively thin shell through which the heat of thesun can )enetrate for eva )oratin the moisture within the lower end of the column to thus avoid the decaying of the wood.

The machine embodiesa tubular or hollow auger shank having an anger at one end to enter the wood, a rea'mer carried by said shank at a distance from the auger, and means for supporting the shank uearthe auger to uphold the shank until the auger has entered the woodsufliciently to support the shank, said means being movable away from the shank to pass said reamer asthe stock and rea-mer come close together.

It is also within the scope of the invention to provide a wood boring machine of-the nature indicated which is comparatively simple and inexpensive in construction and which is practical and efficient in use. I

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details, of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can 'be' made within the scope of what is clhimed without departing from the spirit of the invention. 7

The invention is illustrated in the accompanying drawings, wherein:

Figure l'is a side elevation of the machine, portions being broken away.

Fig. 2 is an enlarged sectional view on the lilie 2 -2 of Fig. 1.

Specification of Letters Patent.

Patented Mar. 33, Edit.

Seriallio. 83,583.

Fig. 3 is a viensimilar to Fig. 2 illustrating a modification.

Fig. l is a plan view of the track used with the modification.

in carrying out the invention, there is pro vided a suitable frame 1 having a lo gitudinal. track embodying the rails or guides 2', a carriage 3 being movable along thetrack and supporting the column or stock 4 which is to be bored, The foregoing parts are only illustrated diagrammatically, since they are well known tion.

A. tubular and need no detailed consideralongitudinal shank journaled at one end through bearings G 'arricd by one end of the frame, and is provided at its other end with an auger T to enter the stock it. said stock and shank 5 being coaxial or in alinement. A pulley wheelS is secured upon the shank 5 between the bearings (l for the, connection of a belt 9 for driving the auger shank.

As a means for conveying the sawdust and chips away from the auger 7, a conveyer screw or worm 10 works within the shank and extends from the auger? toand out of the remote end of the shank 5, and the shank of the conveyer worm '10 is journaled through bearingsll adjacent the bearings 6, a pulley wheel 12 being secured upon said shank between the bearings 11 for the connection of a belt 13 for driving the worm 10.

A pedestal lat is slidable along the track, said pedestal being supported slidahly in any suitable manner, and has a bearing 15 slidably embracing the shank 5 to assist in supporting said shank in its horizontal position. A reamer 16 is secured upon the shank 5. ahead of the pedestal 14.

A'second pedestal or support 17 is slidable along the track between-the auger 7 am: reamer 16, andembodies a pair of upright sections or halves 18 provided at their a'djacent edgeswith notches 19 for receiving the shank 5 when said sections 18 are moved to-- gether, to thus support the free or outer end of the shank 5. The sections 18 are slidahle when the screw is rotated, the sections 18 toward or away from one another. screw 22 is preferably constrained against will be moved in opposite directions either The longitudinal movement of itself, by suitable means 23 carried by the slide 20. h

. In "order to separate the sections 18 when the pedestal 17 approaches the reamer 16, a pinion 24 is secured to one end of the "screw 22, and is adapted to mesh with a rack carried by outstanding brackets 26 attached to one of the rails 2. The pinion 24 is engageable with the rack 25 just before the pe lestal 17 reaches the reamer 16, and whenfihe pinion 2i runs over the rack 25,,

{this will rotate the screw 22, so as to sepa- [rate the sections 18 whereby they are sepa rated sufiiciently to pass the reamer 16, as illustrated in Fig. 2.

The slide 20 can either be attached to the stock carriage 3 to be moved longitudinally therewith, which is also true of the pedestal the auger 7, and the auger 'be reamed out to -shell, which is of advantage, especially out 14:, or the slide 20 can be pushed ahead by the carriagefi after the carriage is brought against the slide 20. The pedestal 14 can either be moved-with the carriage 3 or can be pushed aheadbythe slide 20.

' In operation, the column 4: supported by tered the wood, so as to support the free end of the shank 5, the pedestal 17 can be moved with the carriage 3, and as the pedestal -17 approaches the reamer 16, the pinion 2st in being rotated by the rack 25 will rotate the screw 22 to separate the sections 18 so that they can interference.

pass the reamer 16 without The stock is then brought to the reamer 16, which reams out or counterbores the stock 4, as at 30. The square lower end portion of the column "i can thus leave a relatively thin of doors, to enable the suns heat to penetrate the shell and heat the interior thereof for preventing decay.

When the parts are returned to normal or initial position, the pinion 2st in passing back over the rack 25 will rotate the screw 22 in the opposite direct-ion for returning the sections 18 to contacting position so that they will again embrace the shank 5 for supporting the same when the shank and stock are separated.

Inthe modification illustrated in Figs. 3 and 4, the pedestal 17 embodies the sections 18 having the notches 19 for receiv ing" the tubular auger shank 5, and the lower ends of thesections 1 8 which seat upon the upper edges of the rails 2' are provided with lugs or pins 21 for guiding the sections 18 along the rails, and said rails are provided at suitable points with v oblique cam portions 25 diverging from one another.

said sections for movement to and from one .another, and to hold them in cooperative relation. When thepedestal 17 is moved past the cam portions 25 in approaching the reamer; said cam portions 25 will separate the sections 18 so that they can pass the reamer without interference, and when the pedestal 17' is returned to initial position, the sections thereof will again be brought together by said cam portions'25.

The operation of the pedestal 17 or 17 is entirely automatic. The boring and counterboring of the column is of advantage for lightening the weight thereof, for preventing the column from checking while drying in a kiln, and for increasing the life of the column.

It is preferable to use a worm 31 upon the shank 5 in back of the reamer 16, to facilitate the removal of'the chips from the reamer, and to also enable the reamer to free itself properly.

Having thus described the what is claimed as new is:

1. In a boring machine, an auger shank having an auger at one end, a reainer carried'by said shank, a longitudinally movable support for said shank between said auger and reamer embodying separable sections movable away from the shank to pass said reame'r, and means for automatically separating said sections when said, .support approaches said. reamer.

2. In a boring machine, a longitudinal shank having an auger at one end, a reainer carried by said shank, a longitudinally mov able pedestal for supporting said shank between said auger and reamer and compris ing a pair of sections having notched portions for engaging and supporting said shank, and means for automatically separating said sections when said support is moved toward said reamer in order that the sections can pass said reamer without interference.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

l DELONA L. CALAHAN. Witnesses:

" W. A. Grooms,

E. M. Fosr'rn.

It is also preferable to attach guide rods 22' to one section 18"wh1ch' slide through the other section for guiding invention, 

